Interviews » flemming-rasmussen-riding-the-sweet-silence

Flemming Rasmussen Riding the Sweet Silence

The engineer/producer behind the sound of the '80s Metallica albums is Flemming Rasmussen and his Sweet Silence Studios, located in Copenhagen, Denmark. These early Metallica records, Ride the Lightning, Master of Puppets, ...And Justice for All, brought a whole new light to the sound of what would become heavy metal and thrash.  

Flemming began building Sweet Silence Studios in 1976, in 1980 he became co-owner, and in March 1999 he took over the studio altogether. He began his career as an in-house engineer and soon became known for his sound, as well as his ability to work with all kinds of music, from jazz, folk, and pop to hardcore metal. Everybody who worked with him experienced the feeling of being in “safe hands.” He produced his first album in 1982, working mainly with Danish bands like Sort Sol, but also with international artists, such as Rainbow, Morbid Angel, and Blind Guardian, picking up a Danish Grammy award for Producer of the Year along the way. He prefers to record drums, bass, and guitars on analog tape, using as much vintage gear as possible, then transferring to Pro Tools to do edits, overdubs, and mixdowns. Flemming’s trademark as a producer is that he always works very closely with the musicians, trying to get everything done from their perspectives. Many groups even describe him as their hidden bandmember.

Were there any particular bands or songs at the time that influenced your Metallica productions?

I grew up with an older brother who started listening to the Rolling Stones when they released their first album in 1963. So, my influence is almost any rock band from the mid-1960s and on. But at the time I did the Metallica albums, my favorites were, amongst others, Deep Purple, Thin Lizzy, Led Zeppelin, and Queen. I had never heard trash metal before, but I love aggressive music with a “tuff” sound.

How did the process go? Were the guitar parts written in the studio or already laid out?

Metallica, in that period, made demos. All the songs were composed, arranged, and recorded on a very good demo. We only changed parts slightly on some of the songs.

What microphones were used to record the guitar parts? 

All three albums were recorded analog on 24-track tape machines using Ampex 456 tape. On the first two albums, all mics went through my Trident A Range console. In those days, we used the mic preamps in the console – very few people had external mic pres. On all of the albums, the main mics are the Shure SM7 and Neumann U 87; close-mic'd and pointing to the center of one of the speaker cones. Most guitars were recorded using two cabinets. Then, at an angle of 45 degrees from the corner of the cab and three to six feet away, I used AKG gold The Tube mics; one on each cabinet. For room mics I used Brüel & Kjær [now Danish Audio Design] 4006 omnis, approximately 10 to 15 feet away. On the first two albums, all EQs were the A Range. On …Justice… I used an old 1073-style Neve desk and had a B&B audio EQ inserted on the [effects] loop of the amp! That way, I could tweak the sound of the amp from the control room.

How did you accomplish Metallica’s vision of guitar tones? Was this discussed beforehand, or was it something that came together in the studio?

On the first album, we tried to re-create the sound of one of James Hetfield’s guitar amps that had been stolen just prior to the session. But, for the final result on the albums, it was very much James and I who decided how it should sound, and we pretty much made it up as we went along.

How did you go about getting the rhythm crunch guitars on songs like “For Whom the Bell Tolls” and “Battery”? It sounds as if there are several layers of guitar.

All rhythm guitars were doubled at least once, and at places we have as many as six to eight guitars at the same time. James is so tight that it sounds like one guitar. Some of the guitar sounds were made to fit or add to the main guitars, so when combined it made that big sound we all liked.

On Metallica's song “One," how did you capture the dynamics? Were the quieter parts recorded separately and then spliced together with the aggressive parts?

We recorded the different parts separately and made sounds for the specific part. That included how we overdubbed, so every part sounded the best we could produce. All quiet parts were recorded separately, as were the clean guitars, and all guitars were dubbed in after we’d done the drum tracks. 

Do you have a favorite “can’t live without” recording processor or effect that you used on these recordings?

Oh, yes. My old, trusted Trident A Range desk, Urei 1176LN [compressors], and the Shure SM7. As for guitar effects, I make it up as I go. I always listen to what the amp sounds like in the studio, and if I don’t like it I start tweaking. The source is always the most important. You can’t save a bad guitar sound with EQs and compressors.⁠Tape Op Reel

MORE INTERVIEWS

Kid Harpoon
INTERVIEWS · ISSUE #172 · Mar 2026

Kid Harpoon

By Larry Crane

Tom Hull, better known as Kid Harpoon,  has produced, co-produced, and co-written with an impressive list of high-profile artists over the last 15 years or so, including Harry Styles, David Byrne, Kings of Leon, Miley Cyrus, Inhaler, Florence + the Machine, Shawn Mendes, and Maggie...

Robert Lang
INTERVIEWS · ISSUE #172 · Mar 2026

Robert Lang

By Larry Crane

"They said that the little man couldn't do it. 'Oh, you can't dig 35 feet below your home.' But I did it, one step at a time, man." Thus began our conversation with Robert Lang. Outside of Seattle – in Shoreline, Washington – there's an iconic...

Dan The Automator
INTERVIEWS · ISSUE #172 · Mar 2026

Dan The Automator

By Sam Retzer

It’s Sunday night in Manhattan at Irving Plaza, and Dan “The Automator” Nakamura takes the stage behind a mouthwatering wall of synths, across from Kid Koala [Tape Op#159] and his three turntables. Deltron 3030 is back to rock the same stage where they made their New York debut 25 years...

Regina Spektor
INTERVIEWS · ISSUE #172 · Mar 2026

Regina Spektor Collaboration & Experience

By Geoff Stanfield

The story of Regina Spektor is one of a truly self-made artist. In 1989, at nine years old, Spektor and her family emigrated from Moscow to the Bronx in New York. Her love and affinity for playing the piano found her studying in high school at the Manhattan School of Music, and as she...

Jeff Rosenstock
INTERVIEWS · ISSUE #172 · Mar 2026

Jeff Rosenstock

By Larry Crane

On the suggestion of Tape Op's Sales & Operations Director, Corey Reidy, I decided to check out the career of Jeff Rosenstock. His early bands, The Arrogant Sons of Bitches and Bomb the Music Industry!, built up grassroots followings via a DIY ethic, and, as Corey told me, “He...

Clarissa Connelly
INTERVIEWS · ISSUE #172 · Mar 2026

Clarissa Connelly Creating a Spacious Depth in Sound

By Meredith Hobbs Coons

Clarissa Connelly, the Scotland-born, Copenhagen-based composer, first captured audiences’ attention with her 2018 release, Tech Duinn, and has been creating medieval-tinged multidimensional soundscapes ever since. Informed by her masters' level composition studies at the Rhythmic...